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Nuclear898
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 Posted: Thu Jul 10, 2008 5:21 am Post subject: [C++] printf Vs. cout |
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| Code: | int roflcopter;
roflcopter = 10101010101;
printf("%i",roflcopter);
cout << roflcopter; |
it both does the same, but which ostream is better and why?
I can use both, just don't know which one I should use.
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kitterz
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| Posted: Thu Jul 10, 2008 6:40 am Post subject: |
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| They are both the same, but I think printf lets you specify the type....personally I perfer cout better.
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Symbol
I'm a spammer
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| Posted: Thu Jul 10, 2008 7:13 am Post subject: |
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printf is good for printing long strings with information, its easier to do:
| Code: | | printf("A value is: %d\nA address is: 0x%X\nB value is: %d\nB address is: 0x%X\nSum of A + B: %d", a, &a, b, &b, a + b); |
Than:
| Code: | | cout << "A value is: " << a << "\nA address is: " << &a << "\nB value is: " << b << "\nB address is: " << &b << "\nSum of A + B: " << a + b; |
cout is also very slow:
| Code: | int time = GetTickCount();
for (int i = 1; i <= 1000; ++i)
cout << i << endl;
time = GetTickCount() - time;
cout << time << "Milliseconds.\n" |
While printf is way faster:
| Code: | int time = GetTickCount();
for (int i = 1; i <= 1000; ++i)
printf("%d\n", i);
time = GetTickCount() - time;
printf("%d Milliseconds\n", time); |
Run both programs and see that printf is faster.
Note that without "endl", cout is much faster. (also without '\n', cout/printf is a bit faster, but thats because its 1 character less, 1000 in the whole loop)
Use printf. 
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Nuclear898
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Posts: 1597
Location: The Netherlands
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| Posted: Thu Jul 10, 2008 8:47 am Post subject: |
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Thanks symbol, I already started using printf anyway 
Edit;
Hmm I'm having a little trouble now.
I try to use printf for a string but it shows NULL when executed
when I use cout it works just fine.
| Quote: | #include <iostream>
#include <string>
using namespace std;
double a,b,result,product;
int menuinput, endinput;
string menustring;
double addition(double a,double b)
{
product = a + b;
return (product);
}
double multiplication(double a,double b)
{
product = a * b;
return (product);
}
double division(double a,double b)
{
product = a / b;
return (product);
}
double subtraction(double a,double b)
{
product = a - b;
return (product);
}
int main()
{
system("CLS");
printf("Choose Option: \n1. Addition\n2. Subtraction\n3. Multiplication\n4. Division\nOption:");
cin >> menuinput;
if (menuinput < 1 || menuinput > 4)
{
printf("\nERROR :: Wrong Input!\n\n");
system("pause");
main();
}
printf("\nChoose numbers to");
switch (menuinput)
{
case 1: menustring =" add"; break;
case 2: menustring =" subtract"; break;
case 3: menustring =" multiply:"; break;
case 4: menustring =" divide:"; break;
}
cout << menustring << "\nNumber 1: "; //This is where printf shows NULL
//printf("%s\nNumber1: ",menustring) // <-- This printf
cin >> a;
printf("Number 2: ");
cin >> b;
switch (menuinput)
{
case 1: result = addition(a,b); break;
case 2: result = subtraction(a,b); break;
case 3: result = multiplication(a,b); break;
case 4: result = division(a,b); break;
default:
printf("\nERROR :: Wrong input!\n\n");
system("pause");
main();
break;
}
printf("\n%f\n\nInsert 1 to do another calculation\nor insert 0 to exit\n",result);
cin >> endinput;
if (endinput == 1) main();
else if (endinput != 1) return 0;
return 0;
} |
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Heartless
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Noz3001
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| Posted: Thu Jul 10, 2008 12:33 pm Post subject: |
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| printf is C cout is C++
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